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Material for anisotropic magnet and method of manufacturing the same

A technology of magnetic anisotropy and raw materials, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problem of not being able to obtain sufficient coercive force, not necessarily obtaining sufficient residual magnetic flux density, and being difficult to improve at the same time, etc. problem, to achieve the effect of improving coercive force and high coercive force

Active Publication Date: 2010-07-07
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Technically, the magnetic properties of rare earth magnets with Pr and Nd as the main components have the following trade-off relationship: the coercive force decreases when the residual magnetic flux density is increased, and the magnetic flux density increases when the coercive force is increased. decrease, it is difficult to increase both at the same time
[0010] Therefore, although the magnet alloy described in Patent Document 1 increases the maximum magnetic energy product ((BH) especially by increasing the magnetic flux density max ), but has the problem of not being able to obtain sufficient coercive force
In addition, the magnets described in Patent Documents 2 and 3 have a problem that although high coercive force is obtained, sufficient residual magnetic flux density is not necessarily obtained.

Method used

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  • Material for anisotropic magnet and method of manufacturing the same

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preparation example Construction

[0091] When the component composition and the preparation conditions described later are optimized, the residual magnetic flux density can be increased even if the coercive force is maintained at a high level. This is considered to be due to the absence of coarsening of crystal grains and increase in the oxygen content, and improvement in the degree of orientation of the easy axis of magnetization.

[0092] The crystal grain size of the main phase has an influence on the coercive force. Generally, the smaller the crystal grain size of the main phase, the larger the coercive force. In order to obtain a high coercive force, the crystal grain size is preferably 1 μm or less. The crystal particle size is further preferably 500 nm or less, more preferably 300 nm or less, still more preferably 200 nm or less.

[0093] Here "crystal particle size" refers to the value obtained by the following steps:

[0094] (a) Take a picture of the ab plane of the crystal (the plane parallel to ...

Embodiment 11

[0164] 1. Preparation of Specimen

[0165] An alloy melt having a defined composition is quenched. The obtained ribbon was pulverized to obtain alloy powder. The alloy powder is cold-formed, and the cold-formed body is hot-formed. Further, the thermoformed body is subjected to thermoplastic processing to obtain a magnetically anisotropic magnet raw material.

[0166] The alloy composition is Pr x Fe 94.05-x B 5.5 Ga 0.45 (x=12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0. Contains unavoidable impurities.).

[0167] In addition, the preheating conditions and thermoforming conditions are:

[0168] (1) Preheating at 750°C×10min + hot pressing at 815°C (mold temperature) (with preheating), or

[0169] (2) Hot pressing at 850°C (mold temperature) (without preliminary heating).

[0170] 2. Test method

[0171] 2.1 Magnetic properties

[0172] The magnetically anisotropic magnet raw material was magnetically charged, and its magnetic properties were measured wit...

Embodiment 12

[0191] 1. Preparation of Specimen

[0192] In addition to the alloy composition as Pr 13.09 Fe 81.51-y B 5.4 Ga y (y=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8. Unavoidable impurities are included.) Except that, a magnetically anisotropic magnet raw material was prepared in the same manner as in Example 1.1.

[0193] 2. Test method

[0194] Magnetically anisotropic magnet raw materials were made magnetic, and their magnetic properties were measured with a DC BH tracer.

[0195] 3. Results

[0196] Figure 4 The relationship between Ga content and coercive force (iHc) is shown.

[0197] From Figure 4 As can be seen:

[0198] (1) When the Ga content is less than 0.1 at%, the coercive force (iHc) is extremely reduced,

[0199] (2) When the Ga content exceeds 0.7 at%, the coercive force (iHc) decreases,

[0200] (3) In order to obtain a high coercive force, the Ga content is preferably 0.2 to 0.7 at%, more preferably 0.4 to 0.5 at%.

[0201] (4) When preheating i...

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Abstract

The invention provides a material for anisotropic magnet and method of manufacturing the same. The object of the present invention is to improve coercivity without decreasing remanence. The material for anisotropic magnet, comprises, (1) a Pr-T-B-Ga-based composition containing Pr: 12.5 to 15.0 atomic percent, B: 4.5 to 6.5 atomic percent, Ga: 0.1 to 0.7 atomic percent, and the balance of T and inevitable impurities, wherein T is Fe or obtained by substituting Co for a portion of the Fe; and having, (2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetic alignment is defined by remanence (Br) / saturation magnetization (Js); and (3) a crystal grain diameter of 1 [mu]m or less.

Description

technical field [0001] The present invention relates to a magnetically anisotropic magnet raw material obtained by thermoplastic processing and a manufacturing method thereof. Background technique [0002] In recent years, magnets containing rare earth elements such as neodymium and samarium (rare earth magnets) have been widely used for applications such as engines and generators. Rare earth magnets are used because they have excellent magnetic properties and are relatively inexpensive. The magnetic properties include coercive force (iHc) and residual magnetic flux density (Br) as important indexes. [0003] The coercive force is the magnitude of the magnetic field required to make the magnetization zero. It is generally known that when the coercive force is large, it has excellent heat resistance. [0004] The residual magnetic flux density indicates the magnitude of the maximum magnetic flux density (degree of strength of the magnetic field) in the magnet material. Wh...

Claims

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Application Information

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IPC IPC(8): H01F1/053C22C38/00B22F9/24
CPCC22C1/0441C22C38/005H01F41/0266B22F2998/10C22C38/002C22C2202/02H01F1/0576B22F9/04B22F3/02B22F1/142B22F3/14
Inventor 日置敬子薮见崇生桥野早人
Owner DAIDO STEEL CO LTD
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